<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>堆叠顺序-z-index</title>
  <style>
    div {
      position: absolute;
      width: 200px;
      height: 200px;
    }

    .box1 {
      background-color: pink;
      /* 取值是整数，默认是0，取值越大显示顺序越靠上 */
      z-index: 1;
    }

    .box2 {
      background-color: skyblue;
      left: 100px;
      top: 100px;

      z-index: 2;
    }
  </style>
</head>

<body>
  <div class="box1">box1</div>
  <div class="box2">box2</div>
</body>

</html>